Never had foamy urine, but there was a discussion about this. Wish I could remember who posted it. Maybe search could find it.
You mean after ranting & having a meltdown? I drink lots of water, take a fast paced walk (helps chill the frustration) & take 1-2 units every 1-2 hours. Found this works better for me than large revenge corrections. When this fails, I have one or two glasses of red wine & take a hot bath. Dry wine lowers my BG.
Green tea has caffeine & is a diuretic. This may account for your rise. Even slight dehydration raises my BG & caffeine effects BG for many.